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用定标块校准圆度仪的放大倍数时，一般是将定标块在圆度仪上测量的圆记录放大轮廓图用同心圆模板对线，找出凹下轮廓的径向放大值，然后除以定标块小平面弦高的实际值，其商即为放大倍数。但是，这种方法的缺点是测量准确度不高，不适用于圆度仪自动化程度日益提高带来的快速数字采样自动化校准放大倍数的要求。根据未抑制的定标块圆记录放大轮廓的凹下部分为一弦线的特点，推导了式（８）～（１３）。按要求的采样相邻点的夹角在弦线中点附近的直线上找出三个连续采样值，代入式（８）～（１３），可准确计算出圆度仪的放大倍数。用实例验证了这种新方法的准确性和可行性。
When calibrating the magnification of a roundness meter with a calibration block, it is common to find the radial magnification of the concave contour by aligning the circular record magnified profile measured on the circularity meter with the concentric circle template, and then Divided by the actual value of the calibration chord facet height, the quotient is the magnification. However, the disadvantage of this method is that the measurement accuracy is not high, which is not suitable for the requirements of rapid digital sampling auto-calibration magnification due to the increasing degree of automation of the circularity meter. According to the unreduced calibration block, the concave part of the enlarged outline is recorded as a chord, and expressions (8) ~ (13) are deduced. According to the required sampling angle of adjacent points in the string near the midpoint of the line to find three consecutive samples, into (8) ~ (13), can be accurately calculated circularity magnification. An example is given to verify the accuracy and feasibility of this new method.